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I'm not certain it's true of flexibility, but it seems that Rehau and Wirsbo are easier to work with.
Also, I would highly recommend using a high quality barrier PEX from either Rehau or Wirsbo as they are the only 2 systems i'm aware of that have the least flow restriction at the fittings, and highest reliability.
There is a difference. look for PEX-A which is more workable and repairable if kinked, PEX-B would be my second choice but becoming less available, PEX-C such as Zurn will work fine but kink it and you have to cut it and install a splice coupling. Wirsbo and Rehau mainly market PEX-A.